crypto/bio/bf_nbio.c

   1 /* crypto/bio/bf_nbio.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <errno.h>
  61 #include "cryptlib.h"
  62 #include <openssl/rand.h>
  63 #include <openssl/bio.h>
  64 #include <openssl/evp.h>
  65
  66 /* BIO_put and BIO_get both add to the digest,
  67  * BIO_gets returns the digest */
  68
  69 #ifndef NOPROTO
  70 static int nbiof_write(BIO *h,char *buf,int num);
  71 static int nbiof_read(BIO *h,char *buf,int size);
  72 static int nbiof_puts(BIO *h,char *str);
  73 static int nbiof_gets(BIO *h,char *str,int size);
  74 static long nbiof_ctrl(BIO *h,int cmd,long arg1,char *arg2);
  75 static int nbiof_new(BIO *h);
  76 static int nbiof_free(BIO *data);
  77 #else
  78 static int nbiof_write();
  79 static int nbiof_read();
  80 static int nbiof_puts();
  81 static int nbiof_gets();
  82 static long nbiof_ctrl();
  83 static int nbiof_new();
  84 static int nbiof_free();
  85 #endif
  86
  87 typedef struct nbio_test_st
  88         {
  89         /* only set if we sent a 'should retry' error */
  90         int lrn;
  91         int lwn;
  92         } NBIO_TEST;
  93
  94 static BIO_METHOD methods_nbiof=
  95         {
  96         BIO_TYPE_NBIO_TEST,
  97         "non-blocking IO test filter",
  98         nbiof_write,
  99         nbiof_read,
 100         nbiof_puts,
 101         nbiof_gets,
 102         nbiof_ctrl,
 103         nbiof_new,
 104         nbiof_free,
 105         };
 106
 107 BIO_METHOD *BIO_f_nbio_test(void)
 108         {
 109         return(&methods_nbiof);
 110         }
 111
 112 static int nbiof_new(BIO *bi)
 113         {
 114         NBIO_TEST *nt;
 115
 116         nt=(NBIO_TEST *)Malloc(sizeof(NBIO_TEST));
 117         nt->lrn= -1;
 118         nt->lwn= -1;
 119         bi->ptr=(char *)nt;
 120         bi->init=1;
 121         bi->flags=0;
 122         return(1);
 123         }
 124
 125 static int nbiof_free(BIO *a)
 126         {
 127         if (a == NULL) return(0);
 128         if (a->ptr != NULL)
 129                 Free(a->ptr);
 130         a->ptr=NULL;
 131         a->init=0;
 132         a->flags=0;
 133         return(1);
 134         }
 135
 136 static int nbiof_read(BIO *b, char *out, int outl)
 137         {
 138         NBIO_TEST *nt;
 139         int ret=0;
 140 #if 0
 141         int num;
 142         unsigned char n;
 143 #endif
 144
 145         if (out == NULL) return(0);
 146         if (b->next_bio == NULL) return(0);
 147         nt=(NBIO_TEST *)b->ptr;
 148
 149         BIO_clear_retry_flags(b);
 150 #if 0
 151         RAND_bytes(&n,1);
 152         num=(n&0x07);
 153
 154         if (outl > num) outl=num;
 155
 156         if (num == 0)
 157                 {
 158                 ret= -1;
 159                 BIO_set_retry_read(b);
 160                 }
 161         else
 162 #endif
 163                 {
 164                 ret=BIO_read(b->next_bio,out,outl);
 165                 if (ret < 0)
 166                         BIO_copy_next_retry(b);
 167                 }
 168         return(ret);
 169         }
 170
 171 static int nbiof_write(BIO *b, char *in, int inl)
 172         {
 173         NBIO_TEST *nt;
 174         int ret=0;
 175         int num;
 176         unsigned char n;
 177
 178         if ((in == NULL) || (inl <= 0)) return(0);
 179         if (b->next_bio == NULL) return(0);
 180         nt=(NBIO_TEST *)b->ptr;
 181
 182         BIO_clear_retry_flags(b);
 183
 184 #if 1
 185         if (nt->lwn > 0)
 186                 {
 187                 num=nt->lwn;
 188                 nt->lwn=0;
 189                 }
 190         else
 191                 {
 192                 RAND_bytes(&n,1);
 193                 num=(n&7);
 194                 }
 195
 196         if (inl > num) inl=num;
 197
 198         if (num == 0)
 199                 {
 200                 ret= -1;
 201                 BIO_set_retry_write(b);
 202                 }
 203         else
 204 #endif
 205                 {
 206                 ret=BIO_write(b->next_bio,in,inl);
 207                 if (ret < 0)
 208                         {
 209                         BIO_copy_next_retry(b);
 210                         nt->lwn=inl;
 211                         }
 212                 }
 213         return(ret);
 214         }
 215
 216 static long nbiof_ctrl(BIO *b, int cmd, long num, char *ptr)
 217         {
 218         long ret;
 219
 220         if (b->next_bio == NULL) return(0);
 221         switch (cmd)
 222                 {
 223         case BIO_C_DO_STATE_MACHINE:
 224                 BIO_clear_retry_flags(b);
 225                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 226                 BIO_copy_next_retry(b);
 227                 break;
 228         case BIO_CTRL_DUP:
 229                 ret=0L;
 230                 break;
 231         default:
 232                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 233                 break;
 234                 }
 235         return(ret);
 236         }
 237
 238 static int nbiof_gets(BIO *bp, char *buf, int size)
 239         {
 240         if (bp->next_bio == NULL) return(0);
 241         return(BIO_gets(bp->next_bio,buf,size));
 242         }
 243
 244
 245 static int nbiof_puts(BIO *bp, char *str)
 246         {
 247         if (bp->next_bio == NULL) return(0);
 248         return(BIO_puts(bp->next_bio,str));
 249         }
 250
 251